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L'diaria ii .THEODULE J. v. Roz, or NEW Youn, N. Y. team Patent No.85,965, dazed January 19, 1869.

AUXILIARY KEY-BOARD FOR PIANOS, &c.

To all whom it may concern:

Be it 'known that I, THEODULE J. V. Roz, of the city and .State of NewYork, have invented and made a certain new and useful Improvement inKey-Boards for Pianos and other Musical Instruments; and I do herebydeclarethe followingto be a full, clear, and exact description of thesaid invention, reference ,being had to the annexed drawing, making partof' this -speciication, wherein- Figure 1 4is aplan illustrative ofthemanner in which Ihlgy. elementarykey-board is applied to the usual key-Figure 2 is. a section of the same transversely.

Figure 3 represents a modification of the connections between therespective keys.

Figures 4 and 5 are transverse sections representing the said improvedelementarykey-board with the sol'- vfeggio-attachment.

Similar marks of reference denote the same parts In Letters Patentgranted to'me, April 30, A. D. 1867, an elementary key-board is shown,and also a solfeggio-attachment. i

My present invention is an improvement upon the same, whereby themechanism is rendered much more simple, and less liable to derangement,,and the whole key-board is rendered light4 .and portable, and capableof easyapplication to any piano or other-key-board.

The nature of my present invention consists in the mechanism for raisingthe back ends of the levers that intervene between the elementary andthe main keyboard, so that the elementary key-board can be applied withfacility to the main key-board, without the risk of injury to thelevers, and then the said levers can be pressed down upon the notes.

' I also fit the elementary key-board adj ustably upon slide-supportingarms, in order that the key-board may be adapted to the dilerentthicknesses of' the of pianos below the notes.

In the drawinga a represent the notes (or some oi" them) of the small orelementary key-board. These notes are to be of such a width that thekey-board is adapted to the small hand of the child or person for whoseuse thc key-board is especially intended.

b b are the levers intervening between the key-board c ofthe instrumentand the elementary key-board a.

These levers b are provided, at their back ends, with regulating-screws,5, with button-ends, to take the notes of the piano; and the levers b bdiverge, as illustiated in lig. l, so as to pass from the notes of thesmaller or elementary key-board a to the corresponding notes c of themain key-board.

The elementary key-board is fitted in a case or cabinet, formed of thesides e, bottom f, and a; front of any desired character, and a hingedflap might be provided to enclose the key-board when not in use.

Upon the bottom ofthe piano fixed-slides, g, are attached, into whichthe supporting-arms hare slipped. when the movable elementary key-boardis applied to the piano.

These arms h are attached to the case e by means of bolts passingthrough slots, as at i, so that the case bottom.

and elementary key-board can be raised or lowered to acmmmodate theposition of the main key-board.

The fulcrum-ibrks 2, of the levers l1, are attached to the under side ofthe hinged leaf '75, the same being united to the case e by the hinges3, at the front edge, and resting upon the arms l.

The clamping-screws 4 hold this leaf k down to the arms l, but whenthese are released,'the leaf` la can be raised by hand or by springs, soas to lift the range of fnlcrum-forks 2, and thereby raise theregulating-screws 5 entirely ofi the notes of the piano, so that theele-- mentary key-'board can be applied to or withdrawn from the pianowith convenience.

Ihe connection between the levers b and elementary key-board a may be bythe lifters m, figs. 2, 4, and 5, or it may be by the tension-rod m',fig. 3, the parts being arranged as most convenient for the giveninstrument, with the elementary key-board as high as the main key-board,as in fig; 4, pr lower than' the same, as in g. 3.

In order to hold the levers b up, when raised from the main key-board, Iemploy the -bar a, that is operated by the projecting knobs 7 and isslipped back below the levers b, as in lig. 3, or above them, as in fig.2, the `section of said bal' a being of a wedge-form.

My solfeggio-attachment, as applied with this keyboard, consists in thebent lever o, applied to each key in such manner that the end of thislever o will rise above the case or the table p, and expose the name ofthe note, or its position on the music-a1 scale, by a card, o', or otherprinted device attached to said lever o.

In iig. 4, this solfeggio-attachment is worked by the key a, pressingdirectly uponl theshort end of the lever o.

In' fig. 5, a finger, 8, is shown as rising above the key, to operatesaid lever o.

The regulating-screws, 5, pass through plates, 10, that are attached tothe levers b by a screw, so that the said screws 5 can bc broughtcorrectly over the centre of each note, c, should there be any slightlirregularities or variations in the key-board of the piano.

What I claim, and desire to secure by Letters Pat ent, is-

l. The leaf k, hinged to the case ofthe elementary key-board, andcarrying the fulcruni-lbrks 2, of the levers b, in combination with theclamping-screws 4, c'r their equivalents, asand for the purposes setforth.

2. The elementary key-board, sustained adjustably upon the arms h thatslide into supports below the bed ofthe piano, substantially as and forthe purposes set forth.

3. Iheplates l() and regulating-screws 5, applied to and combined withthe levers b, and elementary keyboarda, as and for the purposes setforth.

. In witness whereof, I have hereunto set my signaf ture, this 18th dayof November, 1868.

T. J. V. RUZ. Witnesses:

OHAs. H. SMITH, GEO. T. PINCKNEY.

